Assessments of forces, surface roughness and chip formation in surface grinding of SKD 61 tool steels using dry and minimum quantity lubrication(MQL) techniques

Abstract

This research aimed to assess normal force, tangential force, surface roughness and chip formation in surface grinding of SKD 61 tool steel using dry cutting (without cutting fluids) and minimum quantity of lubricant (MQL) techniques. The two surface grinding parameters which varied are table speed and depth of cut. Based on the statistical analysis, depth of cut is the most influential factor which affects the four responses in both dry and MQL grinding. The application of MQL could reduce normal force and tangential force considerably, but produces higher surface roughness. Shearing and fracturing are the mechanisms of chip formation in MQL grinding, while in dry grinding were primarily rubbing, ploughing and shearing.